Magazine grinding apparatus for the manufacture of wood-pulp



P. C. SCHAANNING.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE 0F WOOD PULP.

APPLICATION FILED MAR. 27, 1920.

1 ,34 1 1 56, Patented May 25; 1920.

H 1 2 SHEETS-SHEET I.

P. C. SCHAANNING.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE OF WOOD PULP.APPLICATION FILED MAR. 27, 1920.

1,341,15 A Patented May 25,1920.

2 SHEETSSHEET 2.

UNITED STATES,

PATENT OFFICE.

PEDER CHRISTIAN SCI-IAANNING, OF VESTRE AKER, NEAR CHRISTIANIA, NORWAY.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE OF WOOD-PULP.

To all whom it may concern:

Be it known that I, PEDER, CHRISTIAN SCHAANNING, a subject of the Kingof Norway, residing at Vestre Aker, near Christiania, Norway, haveinvented certain new and useful Improvements in Magazine GrindinApparatus for the Manufacture of Woo -Pulp; and I do hereby declare thefollowing to be a full, clear, and exact description ofthe invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being'had to the accompanying drawings,and to letters or figures of reference marked thereon, which form a partof this i specification.

It is a,well-known fact that the greatest difliculty in obtaining afully automatic operation of magazine grinding apparatuses for themanufacture of wood pulp depends upon the peculiar tendency of thewooden blocks to establish self-carrying bridge arches, so that theblocks during the refilling of the grinding com artment do not fall downautomatically. ven if the maga zine widens downwardly the blocks areable to form bridge arches which must be dis turbed byhand power. Thesearches. may be formed between the side walls of the magazine and fromthe pressing plate of the pressing member to the opposite side wall ofthe magazine or to the sharpening device casing, and the archestherebydecrease periodically the effective grinding pressure.

The present invention has for its purpose to remove theseinconveniences.

This is obtained by arranging in the inner wall of. the grindingcompartment 1 or its supply hopper one or more upwardly moving memberswhich constantly carry upward some of the woodenblocks located nearesttothe wall and some of which constitute in case an end block of a bridgearch, so that such arches are incessantly interrupted. The said membersmay move quite slowly andjthey preferably consist of rotatable knots orprojections projecting in through the wall of the supply channel. orhopper about in level with the upper edge of the pressing piston orsomewhat above the same.

Some constructional forms of the invention are illustrated in theaccompanying drawing, in which Figure 1 is a vertical section. through agrindingyapparatus constructed in accordance withthe invention.

Specification of Letters Patent.

the stone 1, and the pistons 2. The dressing device for the stone 1 isarranged at 5.

Upon a shaft 6 two knot or cam disks 7 are arranged a suitable distanceapart so that they may act upon the wooden blocks near their two ends.The drawing shows only one of these disks. The shaft 6 rotates slowly inthe direction of. the arrow 8, whereby the cam projections 7 will enterthe channel through slots in the channel wall 9, then catch the nearestlocated block I and move the blocks slowly upward, whereupon theprojections will be withdrawn againthrough the wall slots. The block row10, "Fig. 2, consequently will be moved slowly upward and therebyconstantly interrupt any bridge arches 11, 12 or 13 that might have beenformed, so that the blocks may always fall freely down into thecompartment in front of the pressing plates 2.

Instead ofa shaft 6 with cam disks 7 endless chains with teeth or knobsmay be arranged as shown in, Fig. 3, or; two screws with 'a large threadpitch may be used as indicated in Fig. 4, or other members may be madeuse of which act so asto move slowly but safely the wooden blocks 10upward and thereby to interrupt the bridge.

arches formed.

In order to counteract the unfavorable fact which does not seldom occur,namely that the blocks which, are not reached by the cams 7 form bridgelarches 12 from the" pressing plate 2 to thelower art of the. innermagazine or channel wal 20 or to another stationary pointin themagazine, a ruler-or list 14 is arranged above the stone 1 in such amanner that it is pressed backward under constantly increased. pressurefrom the spring 15.

The list 14 is moved in guides 21 ar-. ranged concentrically tothjestone 1. It is provided with two racks 16 engaged by gearsegmentsl'i-upon a shaft 18 having an arm I Patented May 25, 1920.

Application filed March 27, 1920. Serial No. 369,324.

1 9"wh'ichp'resses against one end of a spring 15, the other end ofwhich in engagement with the magazine Wall20.

14 will be pressed back in a curved path 'determined by the guides untilthe arch is broken.

A bridge arch 13 which may be formed from the pressing plate 2 to themagazine wall 20 cannot bar the pressure because it is too much inclinedin relation to the pressing direction.

The list 14 is, as mentioned, arranged movably in such a manner that ittravels in a path concentrically to the stone periph ery. In the drawingthis 1s ol tained by attaching the list lij-to one or two sliding pieces22 carrying the racks 16. The list let thereby will perform a pulsatingbuffer motion, what is necessary if the cam disks 7 shall be able tofulfil their purpose in a satisfactory manner.'

It is obvious that the cam disks 7 or equivalent raising members may bearranged at the wall 20 instead of being placed at the wall or suchmember may be arranged at both walls. In the latter case the raisingmembers at the wall 9 should move upward with a speed which is difi'er-.

ent from that of the members arranged at the wall 20. v

1 Claims:

1. In magazine grinding apparatuses for the manufacture of wood pulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said stone, and movable members arranged at or in the wall ofthe magazine or the part of same conducting the blocks tothe spacebetween the stone and the pressing members inisuch a manner as to movethe. blocks located near the said wall part in adirection away from thesaid space, whereby any self-carrying bridgearches of blocks areincessantly, interrupted.

2. In magazine grinding apparatuses for the manufacture of wood pulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said stone, and slowly rotating cam disks arranged in the wallof the magazine or the part of same conducting the blocks to the spacebetween the stone and the pressing members the rotating direction of thedisks being so that their projections act to move the blocks locatednear the said wall part in a direction away from the said space, wherebyany self-carryingbridge-arches of blocks are incessantly interrupted.

.3. In magazine grinding apparatuses for the manufacture of woodpulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said-stone, and slowly rotating cam disks arranged just abovethe said pressing members and having projections entering through slotsin the lower part of the magazine space conducting the blocks down intothe space between the stone and the pressing members, said projectionshaving such a rotating direction as to move the blocks located near thewall of the said magazine part slowly upward, whereby any self-carryingbridge-arches of blocks are incessantly interrupted.

4. In magazine grinding apparatuses for the manufacture of wood pulp asclaimed in claim 1, the arrangement of upwardly movable bridge-archinterrupting members at the lower part of the outer wall of the channelconducting the blocks to the space between the stone and the pressingmember.

5. In magazine grinding apparatuses for the manufacture of wood pulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said stone, upwardly movable members arranged in the wall of themagazine part conducting the blocks to the space between the stone andthe pressing members, and a spring-pressed list arranged at the upperpart ofthe stone so as to be able to yield backward under influence ofpressures from block-bridges formed between the said list and the"pressing member, the upwardly movable members acting to move the blockslocated near the said wall part in a direction away from the said space,whereby any selfcarr ying bridge-arches of blocks are incessantlyinterrupted.

6. In magazine grinding apparatuses for the manufacture of wood pulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said stone, upwardly mo abl; mert ers arranged in the wall ofthe magazine part conducting the blocks to the space between the stoneand the pressing members, a springpressed list arranged at the upperpart of the stone, and guides arranged concentrically with the stoneaxis so as to enable the list to yield backward under influence ofpresssures from block-bridges formed between the said list and thepressing members, the upwardly movable members acting to move the blockslocated near thesaid wall part in a direction away from the said space,whereby any self-carrying bridge-arches of blocks are incessantlyinterrupted.

7. In magazine grinding apparatuses for the manufacture of wood pulp,the combination of a magazine compartment for wooden blocks to beground, a grinding stone, pressing members for forcing said blocksagainst said stone, upwardly movable members arranged in the wall of themagazine part conduetingthe blocks to the space" between the stone andthe pressing members, a springpressed list arranged at the upper part ofthe stone, guides arran ed concentrically with the stone axis,'an aspring-pressed lever transmittingspring-pressure to the list so as toenable it to yield backward with an 10 increasing resistance underinfluence of pressures from block-bridges formed between the said listand the pressing member, the

. upwardly movable members acting to move the blocks located near thesaid wall part in a direction'away from the said space, where- 15 l byany self-carrying bridgearches of blocks are incessantly interrupted.

In testimony that I claim the foregoing as my invention, I have signedmy name in

